Lukaku scored either side of half-time and then set up Michy Batshuayi to tap home Belgium’s fourth.

Belgium’s begin their World Cup campaign against Panama on Monday, while Costa Rica face Serbia in their first game in group E on Sunday.

Luiz’s goal came from a poor clearance from Jan Vertonghen, with the Tottenham centre-back only heading towards the edge of the box, where the former Fulham midfielder connected first time into the bottom corner.

Belgium then dominated the game, with Hazard, Kevin de Bruyne and Mertens a constant trouble to the Costa Rican defence.

Hazard’s deflected shot fell into the path of Mertens for an easy tap-in and Lukaku volleyed in Merten’s cross.

Lukaku added a towering header on 50 minutes, before unselfishly squaring to Batshuayi to score, before he was substituted.